FR: contrast enhancement mode

[raj]

since we are already doing some on-the-fly image processing on the cluster, add contrast enhancement for dan and bitonal for paul. might as well add greyscale too.

[mangtronix (mang)]

+1 from user report comparing this book viewed in different ways:

Half a Century, by Jane Grey Swisshelm (1880)
http://www.archive.org/stream/halfcenturygrey00swisrich#page/n5/mode/2up
  -- light, irregular, hard to read text

compared to
http://books.google.com/books?pg=PA162&dq=intitle:Half+intitle:a+intitle:century+inauthor:swisshelm&ei=r_otTLyTO8vsnQfDrMT8Aw&ct=result&id=Ptl2AAAAMAAJ#v=onepage&q&f=false
quite uniform and readable

DjVu:
http://ia361301.us.archive.org//load_djvu_applet.php?file=5/items/halfcenturygrey00swisrich/halfcenturygrey00swisrich.djvu
terrific

[mangtronix (mang)]

The text legibility could also likely be improved by using a better scaling algorithm.